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Lattice Hamiltonian approach to the Schwinger model: further results from the strong coupling expansion
Marcin Szyniszewski, Krzysztof Cichy, Agnieszka Kujawa-Cichy
We employ exact diagonalization with strong coupling expansion to the massless and massive Schwinger model. New results are presented for the ground state energy and scalar mass ga…
Numerical investigations of the Schwinger model and selected quantum spin models
Marcin Szyniszewski
Numerical investigations of the XY model, the Heisenberg model and the J-J' Heisenberg model are conducted, using the exact diagonalisation, the numerical renormalisation and the d…
Lattice Hamiltonian approach to the massless Schwinger model: precise extraction of the mass gap
Krzysztof Cichy, Agnieszka Kujawa-Cichy, Marcin Szyniszewski
We present results of applying the Hamiltonian approach to the massless Schwinger model. A finite basis is constructed using the strong coupling expansion to a very high order. Usi…